Introduction
Bladder stones (vesical calculi) are hard mineral deposits that form inside the bladder. They range from tiny grains to large stones that irritate the bladder wall, obstruct urine flow, or harbor infection.
They usually develop when the bladder does not empty completely, so urine stays concentrated and minerals crystallize. Incomplete emptying is common with prostate enlargement, neurogenic bladder, strictures, foreign bodies, or long-term catheters.
Symptoms include lower abdominal pain, frequent or painful urination, blood in the urine, and cloudy or foul-smelling urine. Some small stones cause few symptoms until infection or obstruction appears.
This page is educational. Severe pain, fever with urinary symptoms, inability to urinate, or heavy blood in urine needs prompt or emergency care.
Overview
Bladder stones form from concentrated urine and stasis, not from the kidneys alone—though kidney stones can occasionally pass into and grow in the bladder.
Diagnosis uses urinalysis and imaging; cystoscopy both confirms and often treats stones.
Most stones are removed endoscopically; hydration and treating incomplete emptying reduce recurrence.
- Mineral concretions inside the bladder lumen
- Driven by urinary stasis and concentration
- More common in older adults and in men
- Pain, frequency, dysuria, hematuria, and infection risk
- Confirmed by ultrasound, X-ray/CT, or cystoscopy
- Treatment: fragmentation/removal plus correction of emptying problems
What happens in the body
When residual urine sits in the bladder, water is reabsorbed and solutes become supersaturated. Crystals of calcium, uric acid, struvite (infection-related), or other salts aggregate into stones.
Infection with urea-splitting bacteria can alkalinize urine and favor struvite stones. Foreign material (catheter fragments, sutures) can act as a nidus. Large stones may obstruct the bladder neck or urethra and cause acute retention.
- Incomplete bladder emptying → concentrated residual urine
- Mineral crystallization and progressive stone growth
- Infection can promote struvite stone formation
- Stone surface irritates mucosa → hematuria and urgency
- Obstruction raises infection and kidney back-pressure risk
- Recurrence likely if emptying problem is not corrected
Signs and symptoms
Symptoms vary with stone size, number, and whether infection is present. Common possibilities include:
- Lower abdominal or suprapubic pain or pressure
- Pain that may radiate to the back or perineum
- Frequent urge to urinate with small volumes
- Burning or painful urination (dysuria)
- Interrupted stream or sudden stoppage of flow
- Blood in the urine (hematuria)
- Cloudy or foul-smelling urine
- Feeling of incomplete emptying
- Terminal hematuria (blood at the end of voiding)
- In men: worsening of prostate-related voiding symptoms
- In children: unexplained dysuria, enuresis, or recurrent UTI
- Fever and flank pain if infection ascends
Causes and risk factors
Stones form when risk factors combine. Common contributors include:
- Chronic incomplete bladder emptying (BPH, stricture, neurogenic bladder)
- Recurrent urinary tract infections
- Dehydration and highly concentrated urine
- Diet very high in oxalate or animal protein in susceptible people
- Low fluid intake
- Foreign body in the bladder (catheter, migrated IUD fragment, etc.)
- Metabolic disorders such as cystinuria or hyperuricosuria
- Bladder diverticula that trap urine
- Older age and male sex (higher rates)
- Diabetes and mobility limitation as contextual risks
- Prior bladder surgery or radiation in some cases
Diagnosis and evaluation
Evaluation confirms stones, looks for infection, and finds why the bladder does not empty well:
- History of voiding symptoms, prior stones, catheters, or neurologic disease
- Abdominal and genital examination; prostate exam in men when appropriate
- Urinalysis for blood, crystals, and infection
- Urine culture if infection is suspected
- Ultrasound of bladder and kidneys
- Plain X-ray (some stones are radiopaque) or CT when needed
- Cystoscopy to see and treat stones directly
- Post-void residual measurement and uroflow when outlet obstruction is likely
- Differential: UTI alone, bladder tumor, prostate obstruction, interstitial cystitis
Treatment and management
Treatment removes existing stones and addresses the cause of stasis. Do not attempt home “stone flushing” if you cannot urinate or have fever:
- Pain relief as prescribed
- Antibiotics when infection is documented
- Increased supervised hydration when obstruction is absent
- Cystolitholapaxy: endoscopic fragmentation and removal (laser, pneumatic, or mechanical)
- Open or laparoscopic cystolithotomy for very large or complex stones
- Treat prostate enlargement, stricture, or neurogenic bladder contributing to residual urine
- Catheter management review if long-term catheterization is present
- Metabolic evaluation and diet advice for recurrent stone formers
- Rarely, medicines that help dissolve selected uric-acid stones—only under specialist guidance
- Follow-up imaging to confirm clearance
Prevention, self-care, and lifestyle
Not every condition is fully preventable, but the steps below may lower risk or recurrence:
- Drink enough fluids to keep urine pale (unless fluid-restricted for another disease)
- Do not delay voiding; empty the bladder fully when possible
- Treat prostate or neurologic voiding problems early
- Limit excess salt and very high-oxalate loads if advised after stone analysis
- Prevent and promptly treat UTIs
- Attend follow-up after stone removal to check residual urine
- Maintain healthy weight and activity as medically appropriate
Possible complications
Delay, missed care, or unsafe self-medication can raise the chance of complications in some cases:
- Recurrent urinary tract infections
- Acute urinary retention
- Chronic bladder wall thickening and reduced capacity
- Bladder diverticula from long-standing obstruction
- Ascending infection / pyelonephritis
- Kidney damage from back pressure or repeated infection
- Persistent hematuria and anemia in neglected cases
- Stone recurrence if emptying is not fixed
When to see a doctor or seek emergency care
Seek prompt medical advice or emergency care if any of the following apply—it is safer not to wait and see:
- Inability to pass urine
- Severe lower abdominal or back pain
- Fever, chills, or shaking with urinary symptoms
- Persistent or heavy blood in the urine
- Confusion or weakness in older adults with UTI signs
- Known stones with sudden worsening of symptoms
Living with the condition
After removal, ask for your stone composition if analyzed—it guides diet and prevention. Track fluid intake and how completely you empty.
If you have prostate symptoms or a neurologic bladder, stick to the emptying plan (timed voiding, medications, or intermittent catheterization) your clinician set.
Seek care early for burning, fever, or weak stream rather than waiting for another large stone to form.
Frequently asked questions
Are bladder stones the same as kidney stones?
No. They form in the bladder, usually from incomplete emptying. Kidney stones form in the kidney and may occasionally pass down into the bladder.
Can small bladder stones pass on their own?
Tiny fragments sometimes pass with good urine flow, but many stones need endoscopic removal—especially if symptoms or infection are present.
How are they diagnosed?
Urine tests plus ultrasound, X-ray/CT, and often cystoscopy confirm stones and look for the cause of stasis.
Will they come back?
They can, if residual urine, infection, or metabolic risks continue. Treating the emptying problem is the best prevention.
Is surgery always required?
Most symptomatic or infected stones are removed. Very selected uric-acid stones may be managed medically under specialist care.
When is it an emergency?
Go urgently for inability to urinate, high fever with pain, or heavy bleeding with clots.
Important caution
This article is general health education only. It is not a prescription, diet plan, or interpretation of your imaging.
Stone removal and outlet management should be individualized by a clinician after examination and tests.
Seek prompt care for retention, fever, or severe pain—delayed treatment raises infection and kidney risk.